BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Solutions

Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Camping stoves are fueled by propane (C3H8), butane [C4H10(g), ΔfH° = –127.1 kJ/mol]. gasoline. or ethanol (C2H5OH). Calculate the enthalpy of combustion per gram of each of these fuels. [Assume that gasoline is represented by isooctane, C8H18(), with ΔfH° = –259.3 kJ/mol.) Do you notice any great differences among these fuels? How are these differences related to their composition?

images

Interpretation Introduction

Interpretation:

The enthalpy of combustion per gram of propane and butane has to be calculated

Concept Introduction:

The standard enthalpy change of combustion of a compound is the enthalpy change which occurs when one gram of the compound is burned completely in oxygen under standard conditions, and with everything in its standard state

  ΔrH0=ΣnΔfH0(products)-ΣnΔfH0(reactants)

The change in enthalpy, ΔH in kJ per mole of a given reactant for the reaction can be calculated as:

  ΔrH=enthalpy changenumber of moles 

  ΔH=ΔrH×number of moles

Explanation

For propane the balanced equation is as follows:

  C3H8+ 5 O23CO2+ 4 H2O

ΔrH0=[(3mol×-393.5kJ/mol)+(4mol×-285.83kJ/mol)]-[(1mol×-104.7 kJ/mol+0)]

ΔrH0=-2219.12kJ

The change in enthalpy, ΔH in kJ per mole of a given reactant for the reaction can be calculated as:

  ΔrH=enthalpy changenumber of moles 

  ΔrH=-2219.12kJ/mol×1mol44.1g=-50.32J/g.K

So, the enthalpy of combustion is -50.32J/g

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

Cells a. are self-contained, living units. b. serve the bodys needs but have few needs of their own. c. remain ...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

How does the presence of degenerate matter in a star trigger the helium flash?

Horizons: Exploring the Universe (MindTap Course List)

31-8 What are memory cells? What is their function?

Introduction to General, Organic and Biochemistry

Name two strategies for increasing a school-age childs physical activity.

Nutrition Through the Life Cycle (MindTap Course List)

(a) Explain how the quality factor is related to the response characteristics of a radio receiver. (b) Which va...

Physics for Scientists and Engineers, Technology Update (No access codes included)